JPH02135779U - - Google Patents

Description

【図面の簡単な説明】[Brief explanation of drawings]

図面は本考案に係る作業車の油圧アクチユエー
タ操作構造の実施例を示し、第１図は方向切欠弁
及びパイロツト弁の縦断正面図、第２図は方向切
換弁のスプールが一方のストロークエンド付近に
達した状態を示す部分拡大断面図、第３図はバツ
クホウの油圧回路図、第４図はバツクホウにおけ
るエンジンルームの横断平面図、第５図はバツク
ホウの全体側面図、第６図は第１別実施例におけ
る方向切換弁のスプール端部付近の縦断正面図、
第７図は第２別実施例における方向切換弁のスプ
ール端部付近の縦断正面図である。 ３……流量制御機構、１１……方向切換弁、１
１ｂ……方向切換弁のスプール、１１ｄ，１１ｅ
……方向切換弁のパイロツト油室、１１ｆ，１１
ｇ，２２ｂ……絞り部、１３……油圧アクチユエ
ータ、１４……人為操作具、１５ａ，１５ｂ……
排油路、１６……パイロツト弁。 The drawings show an embodiment of the hydraulic actuator operation structure for a working vehicle according to the present invention, in which Fig. 1 is a longitudinal sectional front view of a directional valve and a pilot valve, and Fig. 2 shows a state in which the spool of the directional valve is near one stroke end. Figure 3 is a hydraulic circuit diagram of the backhoe, Figure 4 is a cross-sectional plan view of the engine room in the backhoe, Figure 5 is an overall side view of the backhoe, and Figure 6 is a partial view of the backhoe. A longitudinal sectional front view of the vicinity of the spool end of the directional control valve in the example,
FIG. 7 is a longitudinal sectional front view of the vicinity of the spool end of the directional control valve in the second alternative embodiment. 3...Flow control mechanism, 11...Directional switching valve, 1
1b... Directional switching valve spool, 11d, 11e
...Pilot oil chamber of directional valve, 11f, 11
g, 22b... throttle section, 13... hydraulic actuator, 14... human operating tool, 15a, 15b...
Oil drain path, 16...pilot valve.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 油圧アクチユエータ１３に対して作動油の給排
方向を切換操作するパイロツト操作式の方向切換
弁１１と、流量制御機構３とを直列に接続し、前
記方向切換弁１１に対して切換操作用のパイロツ
ト作動油を給排操作するパイロツト弁１６と、こ
のバイロツト弁１６を切換操作する人為操作具１
４とを備えた作業車の油圧アクチユエータ操作構
造であつて、前記方向切換弁１１のスプール１１
ｂがそのストロークエンドの手前設定位置からス
トロークエンドに至る間にのみ機能する絞り部１
１ｆ，１１ｇ，２２ｂを、パイロツト油室１１ｄ
，１１ｅと排油路１５ａ，１５ｂとの間に設けて
ある作業車の油圧アクチユエータ操作構造。 A pilot-operated directional switching valve 11 for switching the supply and discharge direction of hydraulic oil to the hydraulic actuator 13 and the flow control mechanism 3 are connected in series, and a pilot-operated directional switching valve 11 for switching operation for the directional switching valve 11 is connected in series. A pilot valve 16 for supplying and discharging hydraulic oil, and a human operating tool 1 for switching the pilot valve 16
4, the spool 11 of the directional control valve 11
A throttle part 1 that functions only while b reaches the stroke end from the set position before the stroke end.
1f, 11g, 22b, pilot oil chamber 11d
, 11e and the oil drain passages 15a, 15b.